Monday, February 1, 2010

Threats to Biodiversity

Choose one of the facts below to comment on. Facts can be found a Speciesalliance.org

• One quarter of all mammal species face extinction in 30 years. (United Nations, http://news.bbc.co.uk/)

• For every person in the world to reach present U.S. levels of consumption we would need 4 more planet Earths. (Wilson, p. 23)

• Humans currently consume 50% of the Earth's available freshwater, leaving what's left over for all other species. (World Wildlife Fund, http://www.panda.org/)

• Humans currently consume 40% of all organic matter produced by photosynthesis on Earth, leaving what's left over for all other species. (Wilson, p. 33)

• Every species of great ape on the Earth (gorillas, orangutans, chimpanzees, and bonobos) is in imminent danger of extiction. (United Nations, http://news.bbc.co.uk/)

• Every species of tiger on Earth is in imminent danger of extinction. (World Wildlife Fund, http://web.archive.org/)

• The number of lions left in Africa has fallen 90% in 20 years -- there are now only 20,000 remaining. (BBC, http://news.bbc.co.uk/)

• 90 percent of all large fishes have disappeared from the world's oceans in the past half century. (Nature Magazine, http://www.cnn.com/)

• Human population is expected to increase by at least 50% over the next 75 years. (United Nations Population Division, http://www.enviroliteracy.org/)

8 comments:

  1. I chose the statistic about tigers being in imminent danger of extinction. It stands out to me because thats just wild. Tigers are beautiful and its sad that most of their deaths are being caused by poachers.

    -Jenn D.

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  2. I choose "90 Percent of all large fishes have disappeared from the world'd ocenas in the past half century" I found that one interesting.
    _Khadijah

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  3. "One quarter of all mammal spieces face extinction in 30 years"

    I think that this is extremly alarming and is one reason we need to stop polluting our planet and killing off the only other living organisms that share this planet with us. If a quarter of the mammal species goes extinced in 30 years what's going to happen in 50? 100? are we really going to do something about this? or just let this turn into a fad like the 70's were (I hope not).

    -Carl Martin

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  4. Humans currently consume 50% of the Earth's available freshwater, leaving what's left over for all other species.

    This statistics stands out to me because there is only 1% of freshwater in the entire world and 50% of that is already being used-mostly by rich contries. I predict countries will fight wars over fresh water. The water that we do have is polluted. Recently my son's school had high levels of uranium in his water at school so all of the drinking faucets are shut down. This type of thing will happen more and more and does in the poorer regions of the world. What is then left for plant and animal species? We are only beginning to understand how water pollution is impacting species on our planet.

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  5. 90% of all large fish have disappeared from the worlds oceans in the past half century.
    THATS NUTS
    jacob

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  6. Robert Farr

    Humans currently consume 40% of all organic matter produced by photosynthesis on earth, leaving whats left over for all other species.

    I think this is true because humans eat alot of plants for different variety of things. It is getting a little bit more worse because people are eating more plants (Vegetables) for staying healthy. I think we eat more plants than other species can. It stands out to me because I didn't realize how much organic matter than animals and other species.

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  7. i think that it is crazy that 90 % of all large fishes are extinct within the past half century

    Jordan

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  8. Human population is expected to increase by at least 50% over the next 75 years.

    This statistic stood out to me because as big as the human population is now, the rate going up in so little of time seems crazy.

    Chelsea

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